I split bills with my family relatively frequently and quite often find that requests quickly get buried in the Activity stream of past transactions.
I’m aware that outgoing and incoming payment requests are visible in the Payments tab - however, this still requires proactive checking.
A handy solution might be for outstanding incoming payment requests to be pinned on the home screen - perhaps between the card stack and the Activity section, so they don’t just get lost in the stream of transactions if not acted on immediately. (If needs be, there could be the option to dismiss this pinned section to reduce clutter.)
